JP6439045B2 - Corrugated tube assembly for accommodating electric wire, and method for manufacturing corrugated tube assembly - Google Patents

Description

  The present invention relates to a corrugated tube assembly for accommodating an electric wire or a cable harness. The corrugated tube assembly includes inner and outer corrugated tubes, both of which are made of plastic and have flexibility, a corrugation along the circumference, and one longitudinal slit. The outer corrugated tube can be attached to the inner corrugated tube in a state where the corrugations of both corrugated tubes are radially engaged with each other, and in the attached state, the longitudinal corrugated belt formed on the inner corrugated tube The portion rushes into and covers the longitudinal slit of the outer corrugated tube in the radial direction. The vertical belt portion has a waveform having the same shape and pitch as the outer corrugated tube, and the outer diameter thereof matches the outer diameter of the outer corrugated tube.

  Such a corrugated tube assembly is known from EP 0268869. This known assembly preferably functions to accommodate the cable harness of an automobile and is widely used in this application area. Here, a particularly good flexibility of such a corrugated tube assembly is realized by the corrugations of the outer and inner tubes.

  However, in certain trucks that are used in environments containing severe dust and dirt, such as automobiles for construction sites, dust and dirt particles enter the internal space from the outside of the corrugated tube assembly while the car is in operation. In other words, at the both side edges of the longitudinal slit of the outer corrugated tube, it may penetrate through the open radial end section of the corrugation generated when the longitudinal slit is cut. The dust or dirt particles may reach the position where the longitudinal slit of the inner corrugated tube is formed in the circumferential direction in the radial space between the engaging corrugations of the inner and outer corrugated tubes, These particles are then passed through this longitudinal slit to the inner corrugated tube where an electric wire or cable harness is installed. Of it may enter the inside. This is not desirable at all. This disadvantage is particularly evident in the known corrugated tube assembly in a curved state.

  Based on the above, it is an object of the present invention to develop a known corrugated tube assembly of the kind mentioned in the opening section so that it can be used even in very dusty or dirty environments. Furthermore, a method for manufacturing such a corrugated tube assembly according to the present invention is also provided.

  According to the present invention, in the corrugated tube assembly of the type described in the opening part, the longitudinal slits of the outer corrugated tube and the side edges of the longitudinal strip of the inner corrugated tube, and the both sides of the longitudinal strip are extended. All corrugated radial end sections on the longitudinal side of the remaining cross section of the inner corrugated tube are closed, and the longitudinal band of the inner corrugated tube has one radial direction on each longitudinal side. In the state where the radial cross section extending to the corrugated inner diameter of the inner corrugated tube is connected to the remaining cross section of the inner corrugated tube via a V-shaped depression, and the outer corrugated tube and the inner corrugated tube are combined. , Each side edge of the vertical slit of the outer corrugated tube enters into the V-shaped depression By contact with the longitudinal sides of the longitudinal strip portion of the inner corrugated tube facing, it is realized.

  According to the corrugated tube assembly of the present invention, on the circumference of the outer corrugated tube, between the side edge of the vertical slit and the side edge of the vertical band portion of the inner corrugated tube that has entered the vertical slit. In the inevitably occurring longitudinal slit, no end of every corrugation has an open end cross section that allows dust or dirt to penetrate into the interior of the individual corrugations, but rather all end cross sections A closed structure is secured.

  Therefore, this measure according to the present invention allows dust or dirt to pass through the corrugation of the longitudinal corrugated strip of the inner corrugated tube, as well as the corrugated outer corrugated tube and the remaining inner corrugated engagement with these corrugated Intrusion into the interior of the corrugated tube assembly by a path through the corrugated tube is greatly avoided.

  In the corrugated tube assembly according to the present invention, the longitudinal belt portion of the inner corrugated tube that is offset radially outward and enters the longitudinal slit of the outer corrugated tube in the assembled state is formed on the inner corrugated surface on both longitudinal sides. The remaining portions of the tube are connected to each other through one V-shaped groove, and each side edge of the vertical slit of the outer corrugated tube protrudes into the groove. A radially closed transition region is formed over the entire length of the assembly in a region between the side edges of the remaining cross section of the inner corrugated tube. This transition region comprises a continuous corrugated closed end section on each longitudinal side of the remaining part of the inner corrugated tube and a corrugated closed end section located on the side edge of the associated longitudinal strip. Are connected to each other within a V-shaped depression or groove. The vertical edge of the vertical slit of the outer corrugated tube that has entered each V-shaped depression is well supported by the end face directed radially inward there. On this end face is also located all the closing covers of the corrugated end section present.

  The corrugated tube assembly according to the present invention is preferably suitable for use in vehicles under dusty and dirty environmental conditions, and dirt and dust particles are arranged along the longitudinal direction of the assembly. It is guaranteed not to penetrate inside.

  Vertical corrugated side of the longitudinal corrugated slit of the outer corrugated tube, and the longitudinal corrugated end of the inner corrugated tube, and the ends of the individual corrugations along the longitudinal side located in the remaining cross section of the inner corrugated tube on both sides of this longitudinal strip Closing the cross section can be performed in any suitable shape. However, particularly preferably, the end sections of these corrugations are closed by a cover formed integrally with these corrugations, which covers are formed together in the corrugator when molding the corresponding corrugated tube. Is done.

  In the corrugated tube assembly according to the present invention, the corrugated tubes of both the corrugated tubes preferably have an annular shape or are formed in a spiral shape.

  More preferably, the inner corrugated tube is shaped such that the side wall of each V-shaped depression opposite the longitudinal strip is oriented radially in cross section, whereby the inner corrugated tube is manufactured in the corrugator. In the meantime, both V-shaped depressions can only be formed by one mold half of each mold, which is then pulled radially and removed.

  Instead of this, it is also effective that the side wall of each V-shaped depression connected to the vertical belt portion is oriented in the radial direction in the cross section. In this case, in molding in the corrugator, only one V-shaped depression can be formed by each of the half halves of each mold.

  In the corrugated tube assembly according to the present invention, it is effective that the wall thicknesses of the outer and inner corrugated tubes are the same or substantially the same.

  In addition, when no load is applied to both the corrugated tubes, the width of the vertical slit of the outer corrugated tube is larger than the width of the vertical slit of the inner corrugated tube. Even so, accidental insertion of the outer tube into the longitudinal slit of the inner tube is avoided. Here, it is particularly preferred that the inner corrugated tube is cut along a cutting surface that is simply linearly oriented in the radial direction, and after the slit formation, both side edges of the slits are directly adjacent, Alternatively, it is particularly preferable that they are separated from each other with a very small gap of about 1 mm.

  In a particularly advantageous embodiment of the invention, any corrugated closed end cross section of the outer corrugated tube is located at the side edge of the longitudinal slit of the outer corrugated tube, and likewise the longitudinal corrugated tube of the inner corrugated tube. The corrugated closed end cross-section at each longitudinal side of the strip and the corrugated closed end cross-section at each longitudinal strip of the remaining cross-section of the inner corrugated tube are each associated with a V-shaped depression. It is preferable that it is provided in one plane of the both side walls.

A particularly effective method of manufacturing the above-described assembly according to the present invention is:
a) Extruding the first plastic tube from the extruder and forming an outer corrugated tube for the corrugated tube assembly while forming a waveform along the circumference on the circumference of the corrugator connected downstream. In the outer corrugated tube, no corrugation is provided in the circumferential portion having a predetermined width, and all radial end cross sections of the corrugation on the vertical side surfaces on both sides of the circumferential portion are closed. Being stepped,
b) Extruding the second plastic tube from the extruder and forming a corrugated tube on the circumference at the same pitch as the outer corrugated tube on the circumference of the corrugator connected downstream. Forming an inner corrugated tube for assembly, wherein the inner corrugated tube has a longitudinal belt portion radially outward in a circumferential portion having a width corresponding to the width of the circumferential portion of the outer corrugated tube. The vertical belt portion is connected to the remaining portion of the inner corrugated tube via one V-shaped depression at each of both side edges thereof, and the V The character-shaped depressions extend in the radial direction to the corrugated inner diameter of the inner corrugated tube. Radial cross-sectional end of and, end cross-sectional of the waveform at the vertical sides of the remaining cross-section of both sides of the vertical strip portion of the inner corrugated tube is closed, the steps,
c) generating a longitudinal slit in the outer corrugated tube by cutting off the circumferential portion where no corrugation is formed;
d) forming a slit in the longitudinal direction in the inner corrugated tube;
e) Finally, the step of attaching the outer corrugated tube on the inner corrugated tube with its longitudinal slit elastically expanded, wherein the inner corrugated tube has a vertical band portion of the outer corrugated tube. Piercing in the radial direction into the vertical slit, and attaching each side edge of the vertical slit so as to engage with the V-shaped depression and contact the vertical side surface of the opposing inner corrugated tube. Including.

  The method according to the invention enables a relatively simple and simple production of the corrugated tube assembly according to the invention, which can be assembled in a short time.

  The step of extruding both plastic tubes molded into the outer and inner corrugated tubes may be carried out in one extruder having two separate injection nozzles. In this case, two corresponding mold structures are provided in each mold of one corrugator connected downstream. Preferably, however, two extruders and one identical corrugator connected downstream, respectively, are used to extrude both plastic tubes, whereby the extrusion of both plastic tubes is parallel to each other, From each of these extruders.

  As described above, in the method according to the present invention, the step of forming the slit in the inner corrugated tube is performed along the straight cut surface in the longitudinal direction, and thereby the longitudinal slit having a very small width. Is formed. The longitudinal edges of the longitudinal slits can be directly adjacent or in contact with each other.

  The corrugation of the outer corrugated tube and the inner corrugated tube formed in the method according to the present invention may differ in the shape of the corrugation, but the difference in shape is that when the corrugated tube assembly is bent, the corrugation of the inner tube Must not be too large to disengage the corrugation of the outer tube. In any case, the waveforms of the outer corrugated tube and the inner corrugated tube are implemented at the same pitch.

  When the slit is formed in the inner corrugated tube in the longitudinal direction, the slit is preferably positioned on the opposite side in the diameter direction with respect to the longitudinal belt portion.

  Next, the principle of the present invention will be described in more detail based on examples with reference to the drawings.

It is a perspective view which shows the corrugated tube assembly which concerns on this invention. It is a front view which shows the corrugated tube assembly of FIG. It is a perspective view which shows the outer side corrugated tube of the corrugated tube assembly of FIG. 1, and has shown the state before a vertical slit is cut. FIG. 4 is a (top) view showing the outer corrugated tube of FIG. 3. It is a front view which shows the corrugated tube of FIG. It is a perspective view which shows the inner side corrugated tube of the corrugated tube assembly of FIG. It is a top view which shows the inner side corrugated tube of FIG. It is a front view which shows the inner side corrugated tube of FIG. It is a perspective view which shows the outer side corrugated tube of FIG. 3, and has shown the state after a vertical slit was cut. It is a figure which shows the inner side corrugated tube shown in FIG. 6, and has shown the state after a vertical slit was cut. It is a perspective view which shows the inner side corrugated tube of another embodiment different from the inner side corrugated tube of FIG. It is a perspective view which shows the corrugated tube assembly which concerns on this invention corresponding to FIG. 1 including the inner side corrugated tube of FIG. It is a front view which shows the corrugated tube assembly of FIG. It is the schematic which shows the step for manufacturing the corrugated tube assembly which concerns on this invention.

  In the following description of the drawings, the same members in different drawings are given the same reference numerals.

  FIG. 1 is a perspective view showing a corrugated tube assembly 1 according to the present invention. The corrugated tube assembly 1 is shown in a front view in FIG.

  The corrugated tube assembly 1 is composed of an outer corrugated tube 2 in which an inner corrugated tube 3 is installed, and the corrugated 4 of the outer corrugated tube 2 is engaged with the corrugated 5 of the inner corrugated tube 3, ie A waveform 5 of the inner corrugated tube 3 having the same pitch as that of the waveform 4 of the outer corrugated tube 2 radiates into the waveform 4 in the radial direction.

  The outer corrugated tube 2 is shown in a perspective view in FIG. 3, a top view in FIG. 4, and a front view in FIG. 5. FIGS. 3 to 5 show a state in which no vertical slit is formed yet. The outer corrugated tube 2 is shown. The completed state, that is, the outer corrugated tube 2 after the vertical slits 7 are formed is shown in the perspective view of FIG.

  As apparent from FIGS. 3 to 5, the outer corrugated tube 2 has a waveform 4 on its outer periphery, but the waveform 4 does not extend over the entire outer periphery. From FIG. 3 to FIG. 5, the corrugation 4 is not formed in the circumferential portion having the width B of the outer corrugated tube 2. It can be confirmed that there is a flat material region 20 that forms a part and extends. The material region 20 is cut along the longitudinal edges 10 of the longitudinal slits 7 formed on both sides of the material region 20 to form the longitudinal slits 7 (see FIG. 9) of the outer corrugated tube 2. As a result, the shape of the outer corrugated tube 2 as shown in FIG. 9 is formed.

  All the corrugations 4 of the outer corrugated tube 2 extend to the longitudinal edges 10 on either side of the longitudinal slit 7, and each corrugation 4 forms an end section 13 at each longitudinal edge 10.

  The inner corrugated tube 3 disposed inside the outer corrugated tube 2 is shown in a perspective view in FIG. 6, in a top view in FIG. 6 in FIG. 7, and in a front view in FIG. 6 to 8, the inner corrugated tube 3 has not yet been formed with a vertical slit.

  FIG. 10 shows a configuration of the inner corrugated tube 3 in which the longitudinal slits 8 are formed in the perspective view.

  As shown in FIGS. 6 to 8 and 10, the inner corrugated tube 3 is provided with a waveform 5 along the circumference of the same pitch as the waveform 4 of the outer corrugated tube 2 on the outer periphery thereof. Similarly to the waveform 4 of the outer corrugated tube 2, the waveform 5 along the circumference does not completely extend over the entire circumference. A waveform 5 is not formed on the outer periphery of the inner corrugated tube 3 in a circumferential portion having a width B corresponding to the width of the vertical slit 7 of the outer corrugated tube 2. Instead, there is a longitudinal strip 9 projecting radially outward, as can be seen particularly well in FIG. The vertical belt portion 9 similarly has a waveform 6 on its radially outer surface. The waveform 6 corresponds to the waveform 4 provided on the outer periphery of the outer tube 2 in the shape and pitch, and has the same outer diameter as the waveform 4.

  All the waveforms 5 on the outer periphery of the inner corrugated tube 3 also terminate at each vertical edge 12, and each vertical edge 12 forms an end cross section 13 ′. Are located adjacent to the two longitudinal edges 12 defining the boundary therewith, where each forms an end section 13 ″.

  All end sections 13, 13 ′ at the longitudinal edges 10 of the longitudinal slits 7 or the longitudinal edges 12 of the inner corrugated tube 3 or the longitudinal edges 11 on both sides of the longitudinal strip 9 at which these waveforms terminate; , 13 '' is basically formed as a closed cross section rather than an open cross section. This means, for example, that the end cross-sections 13, 13 ′ and 13 ″ have a cover 14 or 14 ′ or 14 ″ which completely closes each end cross-section (the end wall formed therein) ) Is possible by closing. These covers are generally formed integrally with the corresponding corrugation 4 in the corrugator when the corresponding corrugated tube is formed.

  As shown in FIGS. 6, 8, and 10, the longitudinal strip 9 is connected to the longitudinal edge 12 of the associated corrugation 5 at both side edges 11 on both sides via recesses 16. ing. As is apparent from FIG. 8, the V-shaped recess 16 extends from the outer periphery of the waveform 6 of the vertical belt portion 9 to the inner diameter of the waveform 5 of the inner corrugated tube 3 in the radial direction.

  As can be seen from FIGS. 3 and 5, the end cross section 13 on the vertical edge 10 of the outer corrugated tube 2 extends downward in the radial direction to the inner diameter of the corrugation 4. It may have a slight angular deviation in the range of about 1 ° to 3 ° (in the following, for the sake of brevity, it will always be described only as “radial” orientation).

  When the outer corrugated tube 2 is cut to form the vertical slit 7 and configured as shown in FIG. 9, this is configured in the form of a cover 14 in which the end of the corrugation 4 at the vertical edge 10 extends in the radial direction. Is meant to extend radially inward there.

  In the assembled state of the corrugated tube assembly 1 as shown in FIGS. 1 and 2, the cover 14 of the end cross section 13 extending vertically inward is formed in the V-shaped recess 16 of the inner corrugated tube 3. Has entered. This can be confirmed from the front view of FIG.

  The inner corrugated tube 3 also has a longitudinal slit 8 on the circumference thereof at a position diametrically opposite to the longitudinal strip 9 (as also shown in FIG. 2 or FIG. 10). However, unlike the vertical slit 7 of the outer corrugated tube 2, the vertical slit 8 has only a very small width and is only provided with a cut in the vertical direction along one slit surface. Absent. This can be carried out so that the side surfaces of the longitudinal slits 8 of the inner corrugated tube 3 are in contact with each other or are not adjacent to each other in the assembled state of the corrugated tube assembly 1. Alternatively, the thickness of the vertical slit 8 may be increased.

  As shown in FIG. 1, FIG. 2, or FIG. 10, when the corrugated tube assembly 1 is assembled, the vertical belt portion 9 formed on the inner corrugated tube 3 is in the vertical slit 7 of the outer corrugated tube 2. In this region, the corrugation 6 of the longitudinal strip 9 is configured like a kind of extension of the corrugation 4 of the outer corrugated tube 2 in this region. However, the corrugation 4 and the corrugation 6 have a slight gap in the position where the depression 16 is formed, that is, in the region between the vertical edge 10 of the outer corrugated tube 2 and the vertical edges 11 on both sides of the vertical belt portion 9. And extending along the circumference.

  However, since all end faces 13, 13 'and 13' 'of the waveforms 4, 5, and 6 at the edges 10, 11, and 12 are formed in a closed state, dust from the surroundings is formed. Alternatively, dirt can penetrate into the V-shaped recess 16 but does not enter the waveforms 4, 5 and 6. Since the V-shaped recess 16 is formed of a continuous wall in the cross section and does not have a portion opened to the inside of the corrugations 4, 5, and 6, the corrugated tube assembly 1 is free from dust from the outside. It is completely sealed against penetration of dirt and dirt into its interior. The same applies to the case where the corrugated tube assembly 1 is mounted in a curved state. This is because the cross-sections of all open ends of the waveforms 4, 5, and 6 are formed in a closed state.

  Here, the perspective view of FIG. 11 has shown the inner side corrugated tube 3 of embodiment different from the corrugated tube of FIG.

  The difference between these embodiments is that, in the embodiment according to FIG. 11, as shown most clearly in the front view of FIG. 13, the end cross sections of the corrugations 6 on both sides of the longitudinal strip 9 are located there. The surface of the V-shaped depression 16 on the opposite side of the vertical edge 9 extends at an angle with respect to the radial direction. On the other hand, in the configuration of the V-shaped depression 16 in the examples of FIGS. 6 to 8 and FIG. 10, the side surface of the V-shaped depression 16 on the vertical belt portion 9 side is inclined with respect to the radial direction. However, the side surface on the opposite side of the vertical band portion 9 of the V-shaped recess 16 is different in that it is directed in the radial direction.

  FIG. 14 is a basic view showing steps in manufacturing the corrugated tube assembly 1 according to the present invention.

  A plastic tube 17 is extruded from the extruder 15 and sent to a connected corrugator 18 for molding. As a result, the plastic tube 17 is formed into the outer corrugated tube 2 having a shape as shown in FIGS. Here, the longitudinal slit 7 is not yet formed.

  Thereafter, the corrugated tube 2 is guided by the slit device 19, where the longitudinal slit 7 is formed, so that the part exiting the slit device 19 is the outer corrugated tube 2 in the finished shape as shown in FIG. Corresponding to

  In parallel with the production of the outer corrugated tube 2, another plastic tube 17 ′ is extruded from the second extruder 15 ′, which is connected to the downstream corrugator 18 ′ in FIGS. 8 is formed into a shape corresponding to the shape of the inner corrugated tube 3. Thereafter, the inner corrugated tube 3 passes through the slit device 19 ′, and in this slit device 19 ′, the thin vertical slit 8 is formed on the opposite side in the diameter direction with respect to the vertical belt portion 9 of the inner corrugated tube 3.

  Next, the produced one outer corrugated tube 2 (with longitudinal slit 7) is fed together with the produced one inner corrugated tube 3 (with longitudinal slit 8) to the coupling device 21, where The inner corrugated tube 3 is introduced into the outer corrugated tube 2 through the longitudinal slit 7 of the outer corrugated tube 2. The corrugated tube assembly 1 thus completed is discharged from the coupling device 21.

  Regarding the configuration of the outer corrugated tube 2 and the inner corrugated tube 3, the waveforms 4, 5, and 6 are implemented at the same pitch in both corrugated tubes. 5 can engage in the corrugation 4 of the outer corrugated tube 2 on the radially inner side. Here, the waveform shapes do not have to be completely the same. The corrugations may have different configurations, the difference being that when the tube is bent (when the corrugated tube assembly is attached), the inner tube corrugation 5 and the outer tube corrugation 4 are disengaged. Don't be so big.

  Next, regarding the waveform 6 of the vertical strip 9 of the inner tube 3, the waveform 6 is the waveform 4 of the outer corrugated tube 2 so that the waveform 4 and the waveform 6 extending in the same direction exist outside the corrugated tube assembly 1. Not only have the same pitch but also have the same shape.

  The corrugation itself may extend in a ring shape or may be formed in a spiral shape.

  Generally, the corrugated tube 1 according to the present invention is manufactured according to a manufacturing method as shown in FIG. That is, the outer corrugated tube 2 and the inner corrugated tube 3 are combined and delivered to the customer in a combined state. Mounting the cable or the cable bundle to the corrugated tube assembly 1 is performed on the customer side. In the delivered corrugated tube assembly 1, the customer again separates the outer corrugated tube 2 and the inner corrugated tube 3, and then introduces a desired cable bundle or the like into the inner corrugated tube. The mounted inner corrugated tube 3 is placed in the outer corrugated tube 2 again.

  In the drawing, illustration of an electric wire or a cable bundle introduced into the corrugated tube assembly 1 is omitted. This is because the introduction of these into the corrugated tube assembly is not the subject of the present invention.

  The corrugated tube assembly 1 according to the present invention forms a system closed to the back surface, and is substantially equivalent to hermetically sealing the interior space of the corrugated tube assembly with respect to the outside thereof. Or, even under dirty usage conditions, entry of unwanted dust, dirt, etc. is reliably avoided.

Claims (13)

A corrugated tube assembly for accommodating an electric wire, a cable harness or the like, comprising an inner corrugated tube and an outer corrugated tube, each of the inner corrugated tube and outer corrugated tube being made of plastic and having flexibility, And the outer corrugated tube can be attached to the inner corrugated tube with the inner corrugated tube and the corrugated tube radially engaged with each other, In the attached state, a vertical belt portion formed on the inner corrugated tube enters the vertical slit of the outer corrugated tube in the radial direction to cover the vertical slit, and the vertical belt portion is formed on the outer corrugated tube. Same shape as the waveform of the tube And have a pitch of the waveform, the outer diameter of the wave is coincident with the outer diameter of the waveform of the outer corrugated tube, in the corrugated tube assembly,
Radial directions of all the corrugations on the longitudinal slits of the outer corrugated tube and the side edges of the longitudinal strip of the inner corrugated tube, and the longitudinal sides of the remaining cross section of the inner corrugated tube extending on both sides of the longitudinal strip The end cross section of the inner corrugated tube is closed, and the longitudinal band of the inner corrugated tube has a V-shaped radial cross section extending to the corrugated inner diameter of the inner corrugated tube in each of the vertical side surfaces. Connected to the remaining cross-section of the inner corrugated tube through a recess of
In the state where the outer and inner corrugated tubes are combined, each side edge of the vertical slit of the outer corrugated tube enters into the V-shaped depression and is vertically A corrugated tube assembly characterized by contacting a side surface.   The corrugated tube assembly according to claim 1, wherein the corrugated end section is closed by a cover formed integrally with the corrugation.   The corrugated tube assembly according to claim 1 or 2, wherein the corrugated tubes of the outer and inner corrugated tubes extend annularly or are formed in a spiral shape.   The corrugated tube according to any one of claims 1 to 3, wherein a side wall of each of the V-shaped depressions on a side opposite to the vertical belt portion is directed in a radial direction in a cross section. Assembly.   The corrugated body according to any one of claims 1 to 3, wherein a side wall of each V-shaped depression connected to the vertical belt portion is directed in a radial direction in a cross section. Tube assembly.   The corrugated tube assembly according to any one of claims 1 to 4, wherein the outer and inner corrugated tubes have the same wall thickness.   The width of the vertical slit of the outer corrugated tube is larger than the width of the vertical slit of the inner corrugated tube when no load is applied to the outer and inner corrugated tubes. The corrugated tube assembly according to any one of claims.   The corrugated tube assembly according to any one of claims 1 to 7, wherein the corrugated closed end section of the outer corrugated tube is located at a side edge of a longitudinal slit of the outer corrugated tube. . The corrugated closed end cross section of the inner corrugated tube on each longitudinal side of the longitudinal strip of the inner corrugated tube and the end section on each longitudinal side of the remaining cross section of the inner corrugated tube are related V The corrugated tube assembly according to any one of claims 1 to 8, wherein the corrugated tube assembly is located on different planes of both side walls of the character-shaped depression. It is a manufacturing method of the corrugated tube assembly according to any one of claims 1 to 7,
a) Extruding the first plastic tube from the extruder and forming an outer corrugated tube for the corrugated tube assembly while forming a corrugation along the circumference on the circumference of the corrugator connected downstream. In the outer corrugated tube, a corrugation is not provided in a circumferential portion having a predetermined width, and all radial end cross sections of the corrugation are on the vertical side surfaces on both sides of the circumferential portion. Closed, steps,
b) Extruding the second plastic tube from the extruder and forming a corrugated tube along the circumference at the same pitch as the outer corrugated tube on the circumference of the corrugator connected downstream. Forming an inner corrugated tube for assembly, wherein the inner corrugated tube has a longitudinal belt portion radially outward in a circumferential portion having a width corresponding to the width of the circumferential portion of the outer corrugated tube. The vertical belt portion is connected to the remaining cross section of the inner corrugated tube via one V-shaped depression at each of both side edges thereof, and the V The character-shaped depression extends in the radial direction to the corrugated inner diameter of the inner corrugated tube. Radial cross-sectional end of the waveforms, and, the end section of the waveform in the longitudinal sides of the remaining cross-section of both sides of the vertical strip portion and the inner corrugated tube is closed, the steps,
c) generating a longitudinal slit in the outer corrugated tube by cutting off the circumferential portion where no corrugation is formed;
d) forming a slit in the longitudinal direction in the inner corrugated tube;
e) Finally, attaching the outer corrugated tube on the inner corrugated tube with its longitudinal slit elastically expanded, wherein the inner corrugated tube has a vertical band portion of the outer corrugated tube. Piercing in the radial direction into the vertical slit, and each side edge of the vertical slit engages in a V-shaped depression and is attached so as to contact the vertical side surface of the opposed inner corrugated tube; Including methods.   The method of claim 10, wherein the steps of extruding both of the plastic tubes are performed in parallel with each other from their own extruders.   The method according to claim 10 or 11, wherein the step of forming a slit in the inner corrugated tube is performed along a straight cut surface in the longitudinal direction thereof.   The method according to claim 10, wherein the corrugations of the outer corrugated tube and the inner corrugated tube are formed at the same pitch.

Images